From patchwork Wed Nov 30 18:21:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 629860 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 43EFCC4321E for ; Wed, 30 Nov 2022 18:25:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230217AbiK3SZl (ORCPT ); Wed, 30 Nov 2022 13:25:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230123AbiK3SZg (ORCPT ); Wed, 30 Nov 2022 13:25:36 -0500 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8AE7B6314; Wed, 30 Nov 2022 10:25:29 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 058E7CE1ACC; Wed, 30 Nov 2022 18:25:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C0D68C433C1; Wed, 30 Nov 2022 18:25:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669832726; bh=62Fqnu0SpwoA4vK91A3SZ3ETuJz1j4DVnrjfKEssupE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TkODjCpudfDhF+W3v5wVNN0s2cMZERDF3zqrCCpxNTimPBGEP0hLDKiefO70fms5O 8oqSVh8EAO+GboYd+i1fGbGpUPeprUaZ/RrPjUI6B5ZHj6NdOvQvk4ZoBk/M7HaefE gUibNnexdysWD8LY3He/l0B0I6hd6ROB72zgwjjc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kalle Valo , linux-wireless@vger.kernel.org, "Jason A. Donenfeld" , Sasha Levin Subject: [PATCH 5.10 019/162] wifi: airo: do not assign -1 to unsigned char Date: Wed, 30 Nov 2022 19:21:40 +0100 Message-Id: <20221130180529.017718295@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221130180528.466039523@linuxfoundation.org> References: <20221130180528.466039523@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Jason A. Donenfeld [ Upstream commit e6cb8769452e8236b52134e5cb4a18b8f5986932 ] With char becoming unsigned by default, and with `char` alone being ambiguous and based on architecture, we get a warning when assigning the unchecked output of hex_to_bin() to that unsigned char. Mark `key` as a `u8`, which matches the struct's type, and then check each call to hex_to_bin() before casting. Cc: Kalle Valo Cc: linux-wireless@vger.kernel.org Signed-off-by: Jason A. Donenfeld Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20221024162843.535921-1-Jason@zx2c4.com Signed-off-by: Sasha Levin --- drivers/net/wireless/cisco/airo.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/cisco/airo.c b/drivers/net/wireless/cisco/airo.c index 0569f37e9ed5..8c9c6bfbaeee 100644 --- a/drivers/net/wireless/cisco/airo.c +++ b/drivers/net/wireless/cisco/airo.c @@ -5236,7 +5236,7 @@ static int get_wep_tx_idx(struct airo_info *ai) return -1; } -static int set_wep_key(struct airo_info *ai, u16 index, const char *key, +static int set_wep_key(struct airo_info *ai, u16 index, const u8 *key, u16 keylen, int perm, int lock) { static const unsigned char macaddr[ETH_ALEN] = { 0x01, 0, 0, 0, 0, 0 }; @@ -5287,7 +5287,7 @@ static void proc_wepkey_on_close(struct inode *inode, struct file *file) struct net_device *dev = PDE_DATA(inode); struct airo_info *ai = dev->ml_priv; int i, rc; - char key[16]; + u8 key[16]; u16 index = 0; int j = 0; @@ -5315,12 +5315,22 @@ static void proc_wepkey_on_close(struct inode *inode, struct file *file) } for (i = 0; i < 16*3 && data->wbuffer[i+j]; i++) { + int val; + + if (i % 3 == 2) + continue; + + val = hex_to_bin(data->wbuffer[i+j]); + if (val < 0) { + airo_print_err(ai->dev->name, "WebKey passed invalid key hex"); + return; + } switch(i%3) { case 0: - key[i/3] = hex_to_bin(data->wbuffer[i+j])<<4; + key[i/3] = (u8)val << 4; break; case 1: - key[i/3] |= hex_to_bin(data->wbuffer[i+j]); + key[i/3] |= (u8)val; break; } }